WowAce

Provides data about all artifacts in the player's possession.

Automate Your GDKP Auctions, Bids, & Payouts

Give logical progression of Mining, Herbalism & Skinning. Will not be updated with WoD zones

SysMon plugin for any DataBroker display.

Priority 3 loot announce addon

Generate a macro with random mounts

Fires events whenever a raid member "fails".

ChatHighlighter

FuBar_AmmoFu

Emerge@Durotan-EU Raid Tracker

ComboSounds

Provides access to all teleporting spells and items on right click of minimap button.

XP and Reputation bars

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Library to help with querying unit talents.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Shows the health of the player's current bodyguard.

FuBar_TinyPadFu

In-game EPGP guild helper, supports standby, main/alt shared pools, minEP, offpecGP. Fixed price list with progress multiplier.

A superior broker/LDB display for users of the Recount damage-meter.